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Instrumental magnitude conversion method for star sensor based on infinite-dimension space

A technology of star sensor and conversion method, which is applied in the field of star sensor, can solve the problems of navigation star catalog deviation, collapse, and reduce the performance of star map recognition algorithm, etc., to achieve the effect of guaranteed descent, loose use conditions, and guaranteed speed

Active Publication Date: 2019-09-27
BEIHANG UNIV
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Problems solved by technology

Since the spectral response band of this kind of star sensor is far from the apparent band, if the conversion of the instrument magnitude is not performed, there will be serious deviations between the generated navigation star catalog and the real situation, thereby greatly reducing the performance of the star map recognition algorithm even lead to a crash

Method used

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  • Instrumental magnitude conversion method for star sensor based on infinite-dimension space
  • Instrumental magnitude conversion method for star sensor based on infinite-dimension space
  • Instrumental magnitude conversion method for star sensor based on infinite-dimension space

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Embodiment

[0103] Hipparcos H p The band is used as the instrument band, and the other five bands (V, B, V T , B T , all or part of I) participate in the instrument magnitude conversion, and the H provided by the Hipparcos catalog p The magnitude data (with an accuracy of 0.001 etc.) is used as the magnitude true value to check the accuracy of the conversion method of the present invention.

[0104] First, all the stars whose apparent magnitude is less than 7.5 magnitude in the Hipparcos catalog are selected, and the variable stars are removed to obtain a test data set, with a total of 19,720 stars. Secondly, according to the band selection rule proposed by the present invention, when calculating H p For the instrument magnitude of the band, V, B, V should be selected T , B T The magnitude data of these four bands are involved in the calculation of the magnitude. Next, use the method of the present invention to calculate H p Magnitude. Finally, the accuracy of the conversion meth...

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Abstract

The invention discloses an instrumental magnitude conversion method for a star sensor based on an infinite-dimension space. The method comprises the following steps: 1) using an infinite-dimensional vector in the infinite-dimensional space to describe a star spectral illuminance function and a band spectral response function; 2) obtaining the functional relation between the infinite-dimensional vector and the magnitude of each band through modeling analysis; 3) selecting the optimal band combination according to the band selection rule and establishing the corresponding redundant equations; 4) and solving the redundant equations by using the optimization algorithm with limited step size and direction and finally obtaining the instrument magnitude. The redundant equations of the multi-band magnitude data are solved to calculate the instrument magnitude so as to effectively reduce conversion error and improve conversion accuracy. As for the band selection rule, the optimal data source band combination can be automatically selected for different instrument bands so as to have good universality to a certain extent and be popularized for the conversion of other instrument stars of different bands.

Description

technical field [0001] The invention relates to the technical field of star sensors, in particular to an instrument magnitude conversion method for star sensors based on infinite dimensional space. Background technique [0002] The star sensor is a commonly used attitude measurement instrument. Because the attitude measurement accuracy of the star sensor is very high, and its measurement error does not accumulate over time compared with the gyroscope, it is widely used in satellites, missiles and aircraft. [0003] The star sensor uses the star map recognition algorithm to determine its own attitude to achieve measurement, and the establishment of the navigation star library in the star map recognition algorithm and some algorithms for star map recognition using star magnitude information are inseparable from accurate instrument magnitude data. Therefore, the conversion of instrument magnitude is the basis and an important part of the star map recognition algorithm. When e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/02G06F17/16G06F17/11
CPCG01C21/02G06F17/11G06F17/16
Inventor 江洁马岩张广军
Owner BEIHANG UNIV
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